Two different food preservatives are applied to different cuts of meat to seehow many days they go before spoiling. Suppose 18 cuts of meat aretreated with preservative A and 14 are treated with preservative B. Theresults are summarised as follows:Preservative PreservativeABSample means85.2590.50Sample standard deviation11.459.55To test if there is a difference in the population variances, the appropriatedegrees of freedom (in the correct order) for the critical value are..Select one:O A. 18, 14В. 17, 13ОС. 13, 17D. 14, 18When testing for the difference between two population proportions, if fo =0.35, ny = 51, ny = 56 and fy= 0.39, what is the value of fy? (Hint: fo isthe weighted average of the two sample proportions.)Select one:A. 0.29В. 0.33C. 0.31D. 0.35When looking at an F table, assuming that sy < sy, the appropriatedegrees of freedom are..Select one:O A. ny + ny - 2 and numerator.B. nx as numerator and ny as denominator.O C. nx - 1 as numerator and ny - 1 as denominator.O D. nx - 1 as denominator and ny - 1 as numerator.An instructor is interested in the ability of students to predict their grades.The instructor claims that the population mean prediction is 80 percent. Toverify this, ten students were asked to predict their grades with thefollowing results...Number ofStandardVariableObservations MeanDeviationPrediction10746.8If the instructor wants to test the claim at the 10 percent level ofsignificance (with a corresponding critical value of 2.862), the appropriatetest statistic and conclusion of the test are...Select one:A. t= 2.790; do not reject Ho-B. t= -2.790; reject Ho.O C. t= -2.647; reject Ho-OD. t= -2.647; do not reject Ho.

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The following information is available for two samples selected from independent normally distributed populations. Population A: n1=30 S2/1=25 Population B: n2=30 S2/2=36 a. Which sample variance do you place in the numerator of FSTAT? b. What is the value of FSTAT?
You are testing the claim that having lights on at night increases weight gain (abstract). A sample of 10 mice lived in an environment with bright light on all of the time and 8 mice who lived in an environment with a normal light/dark cycle is given below. Test the claim using a 10% level of significance. Assume the population variances are unequal and that the weight changes are normally distributed. Give answers to 3 decimal places. Data available at StatKey, choose Mice Wgt Gain-2e data set Light (x₁) 1.71 4.67 4.99 5.33 5.43 6.94 7.15 9.17 10.26 11.67 What are the correct hypotheses? Note this may view better in full screen mode. Select the correct symbols in the order they appear in the problem. Ho: Select an answer ? V Select an answer V Ha: Select an answer ✓ Based on the hypotheses, find the following: Test Statistic = Dark (₂) 2.27 2.53 2.83 4 4.21 4.6 5.95 6.52 p-value = ? V Select an answer V (Hint: difference in means from Ha) The correct decision is to Select an answer…
If other factors are held constant, which of the following sets of data would produce the largest value for an independent-measures t statistic? Question 3 options: The two samples both have n = 15, with sample variances of 20 and 25. The two samples both have n = 15, with variances of 120 and 125. The two samples both have n = 30, with sample variances of 20 and 25. The two samples both have n = 30, with variances of 120 and 125.
"A large candy manufacturer produces, packages and sells packs of candy targeted to weigh 52 grams. A quality control manager working for the company was concerned that the variation in the actual weights of the targeted 52-gram packs was larger than acceptable. That is, he was concerned that some packs weighed significantly less than 52-grams and some weighed significantly more than 52 grams. In an attempt to estimate the variance of the weights of all of the 52-gram packs the manufacturer makes, he took a random sample of n = 20 packs off of the factory line. The random sample yielded a sample variance of 3.5 grams. Use 90% confidence level. What is the confidence interval for the variance of the weight of the candy?"
suppose that we have disjoint normal populations A and B and we want to find the standard error estimate for estimating the difference in their means. We have an IRS from A of size 8 with variance 25 and an IRS from B of size 9 with variance 16. What is the resulting standard error estimate if we assume both populations have the same population variance?
Post-hoc tests are necessary for an analysis of variance comparing only two treatment conditions. t or f
An experiment where a patient's blood pressure is measured before a treatment (call it X;) and after the treatment (call it Y;). The difference in the blood pressue of each patient, Z; = Y; – X; is also recorded. The sample size n of patients is large. Suppose the true population mean of the patient's blood pressure before treatment is 41 and after treatment is 42, both unknown. Suppose the true population variance of the patient's blood pressue before and after treatment are the same, but unknown. Find an approximate 1-a confidence interval for 12 - 41- 2.
You are testing the claim that having lights on at night increases weight gain (abstract). A sample of 10 mice lived in an environment with bright light on all of the time and 8 mice who lived in an environment with a normal light/dark cycle is given below. Test the claim using a 2% level of significance. Assume the population variances are unequal and that the weight changes are normally distributed. Give answers to 3 decimal places. Data available at StatKey, choose Mice Wgt Gain-2e data set Light (1) 1.71 4.67 4.99 5.33 5.43 6.94 7.15 9.17 10.26 11.67 What are the correct hypotheses? Note this may view better in full screen mode. Select the correct symbols in the order they appear in the problem. Ho: ₁ Test Statistic = Dark (₂) 2.27 2.53 2.83 4 4.21 4.6 5.95 6.52 Ha: ₁ Based on the hypotheses, find the following: p-value = = V Select an answer ✓ Select an answer (Hint: difference in means from H₂) The correct decision is to fail to reject the null hypothesis The correct summary…
Suppose the average height of all humans is normally distributed with a mean of 72 inches and a variance of 18 inches. Use this information to answer the following three questions. 1. Determine P(75<x<84). 2. Determine P(x>80). 3. Determine P(x < 65).
In the experiment of A and B consumers, 12 sample points are set for A consumers, and the average value of word-of-mouth is 3 with a variance of 1.2; 8 sample points are set for B consumers, and the average value of word-of-mouth is 5 with a variance of 1.6. Compare whether there is significant difference between the average word-of-mouth of A and B consumers. (a=0.05)
Which of the following is not a sample property of OLS? a. Sample covariance of each included variable and the residuals is zero b. the sum of all residuals is zero c. the average of all residuals is zero d. the covariance of x and y is on the regression line.
Choose the alternative that best answer the questions: I. Perfect multicollinearity occurs when the correlation coefficient between two independent variable is zero or closer to zero. II. Perfect multicollinearity will produce unbiased estimates II. Perfect multicollinearity will produce estimates with higher variance IV. Perfect multicollinearity should be ignored in the regression model and all variables should be kept in the model. O Only I is TRUE ALL are TRUE Only IV is TRUE O Only Il and III are TRUE

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To test if there is a difference in the population variances, the appropriate degrees of freedom (in the correct order) for the critical value are...